Load Specifications
Bullet:.308 | 165gr | Geco STAR
Bullet Manufacturer:Geco
Bullet Weight:165 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 WSM load data
Case Length (l3):2.09"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:81.3 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:13.0
Load data in caliber .300 WSM with .308 | 165gr | Geco STAR bullet and 100 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and ReloadSwiss RS 70.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 56,507 psi | 89% | 2815 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,143 psi | 86% | 2838 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,492 psi | 87% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,593 psi | 87% | 2851 fps | 97.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,467 psi | 67% | 2736 fps | 96.5% |
| Accurate 4064 | <<locked>> | 90% | 55,317 psi | 87% | 2887 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,724 psi | 87% | 2982 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 55,767 psi | 87% | 2923 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,956 psi | 89% | 2927 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,752 psi | 86% | 2874 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,869 psi | 88% | 2848 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,709 psi | 87% | 3048 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,043 psi | 89% | 2946 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,696 psi | 90% | 2972 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,985 psi | 89% | 3041 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,636 psi | 86% | 3022 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,654 psi | 64% | 2769 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,759 psi | 72% | 2940 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,956 psi | 88% | 2943 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 53,954 psi | 85% | 2910 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,244 psi | 85% | 2884 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,492 psi | 89% | 2858 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,128 psi | 85% | 2900 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,507 psi | 89% | 3009 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 54,752 psi | 86% | 2854 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,085 psi | 86% | 2927 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 56,550 psi | 89% | 3005 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 98% | 57,116 psi | 90% | 2969 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 86% | 56,333 psi | 88% | 2933 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,055 psi | 83% | 2910 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,347 psi | 88% | 2972 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,738 psi | 87% | 3022 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,505 psi | 56% | 1785 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,492 psi | 89% | 2920 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,853 psi | 86% | 2890 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,535 psi | 87% | 2894 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,911 psi | 86% | 2867 fps | 98.1% |
| IMR 4350 | <<locked>> | 98% | 54,607 psi | 86% | 2910 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,246 psi | 88% | 2917 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,864 psi | 78% | 2874 fps | 99.4% |
| IMR 4895 | <<locked>> | 88% | 55,332 psi | 87% | 2946 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,752 psi | 86% | 2874 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,738 psi | 87% | 2900 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,317 psi | 87% | 2854 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,289 psi | 88% | 2904 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,550 psi | 87% | 2910 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 56,579 psi | 89% | 2946 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 54,360 psi | 85% | 2867 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,085 psi | 86% | 2867 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,869 psi | 89% | 2959 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,434 psi | 87% | 2963 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 45,600 psi | 71% | 2894 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 54,781 psi | 86% | 2969 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 53,795 psi | 84% | 2930 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,116 psi | 90% | 3022 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 55,129 psi | 86% | 2897 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,737 psi | 86% | 2913 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,448 psi | 87% | 2874 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,897 psi | 56% | 1824 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,580 psi | 90% | 2900 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,419 psi | 87% | 2910 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,679 psi | 86% | 2986 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,346 psi | 85% | 3022 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,608 psi | 87% | 3005 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,984 psi | 86% | 3035 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 55,056 psi | 86% | 2844 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,984 psi | 86% | 2867 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,493 psi | 90% | 2953 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,244 psi | 85% | 2884 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,550 psi | 87% | 2910 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,738 psi | 87% | 2900 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,289 psi | 88% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,579 psi | 89% | 2946 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,999 psi | 88% | 2969 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,334 psi | 90% | 2930 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,346 psi | 85% | 2897 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,840 psi | 88% | 2805 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,391 psi | 88% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,811 psi | 87% | 2861 fps | 98.2% |
| Somchem S321 | <<locked>> | 82% | 55,956 psi | 88% | 2904 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,288 psi | 87% | 2802 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,043 psi | 89% | 2920 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,331 psi | 85% | 2900 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,721 psi | 83% | 2969 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,791 psi | 76% | 2848 fps | 96.4% |
| Unknown powder | <<locked>> | 96% | 55,651 psi | 87% | 2976 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 82% | 54,389 psi | 85% | 2749 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,622 psi | 87% | 2782 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,868 psi | 86% | 2831 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,839 psi | 86% | 2838 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,680 psi | 87% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,536 psi | 89% | 2949 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 54,404 psi | 85% | 2881 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,607 psi | 86% | 2867 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,492 psi | 89% | 2995 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,759 psi | 70% | 2844 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,667 psi | 90% | 2943 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,956 psi | 88% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,550 psi | 89% | 3005 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,100 psi | 57% | 2769 fps | 99.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 49,937 psi | 78% | 2723 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,148 psi | 66% | 2641 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,196 psi | 76% | 2789 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 45,629 psi | 72% | 2684 fps | 95.3% |
| Accurate 3100 | <<locked>> | 98% | 39,624 psi | 62% | 2680 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 39,885 psi | 63% | 2638 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,837 psi | 53% | 2569 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 46,151 psi | 72% | 2762 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,117 psi | 61% | 2608 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,312 psi | 76% | 2772 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,776 psi | 76% | 2749 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,090 psi | 66% | 2799 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,812 psi | 61% | 2631 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,756 psi | 65% | 2697 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,243 psi | 54% | 2589 fps | 95.8% |
| Alliant Reloder-17 | 55.5 gr | 80% | 33,417 psi | 52% | 2595 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,486 psi | 46% | 2484 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,680 psi | 57% | 2736 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,527 psi | 71% | 2769 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 38,348 psi | 60% | 2631 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 44,817 psi | 70% | 2717 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,734 psi | 78% | 2753 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,195 psi | 74% | 2792 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,417 psi | 82% | 2946 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 80% | 51,300 psi | 80% | 2805 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,276 psi | 62% | 2638 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 86% | 42,772 psi | 67% | 2762 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 92% | 47,282 psi | 74% | 2802 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 46,586 psi | 73% | 2776 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,283 psi | 46% | 2425 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,103 psi | 63% | 2694 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 90% | 44,512 psi | 70% | 2818 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,310 psi | 41% | 1591 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,249 psi | 65% | 2657 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 42,467 psi | 67% | 2697 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,276 psi | 60% | 2585 fps | 97.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 42,989 psi | 67% | 2654 fps | 95.5% |
| IMR 4350 | <<locked>> | 92% | 45,237 psi | 71% | 2746 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,685 psi | 68% | 2697 fps | 95.6% |
| IMR 4831 | <<locked>> | 88% | 33,823 psi | 53% | 2552 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 42,801 psi | 67% | 2730 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 48,312 psi | 76% | 2772 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,368 psi | 71% | 2740 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,890 psi | 72% | 2697 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 40,872 psi | 64% | 2644 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 38,101 psi | 60% | 2585 fps | 95.5% |
| Lovex S070 | <<locked>> | 88% | 41,060 psi | 64% | 2667 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 44,904 psi | 70% | 2710 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,455 psi | 71% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,133 psi | 64% | 2684 fps | 98.8% |
| Norma 204 | <<locked>> | 96% | 51,634 psi | 81% | 2900 fps | 95.7% |
| Norma MRP | <<locked>> | 98% | 42,482 psi | 67% | 2828 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 34,272 psi | 54% | 2575 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 40,799 psi | 64% | 2700 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 38,189 psi | 60% | 2671 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 48,138 psi | 75% | 2779 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,848 psi | 75% | 2799 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,938 psi | 81% | 2822 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,731 psi | 42% | 1634 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 54,085 psi | 85% | 2851 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,740 psi | 62% | 2621 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,266 psi | 69% | 2805 fps | 98.9% |
| ReloadSwiss RS 60 | 55.5 gr | 80% | 35,621 psi | 56% | 2664 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,779 psi | 53% | 2589 fps | 95.2% |
| ReloadSwiss RS 70 | 60.6 gr | 86% | 36,143 psi | 57% | 2654 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 48,747 psi | 76% | 2749 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,830 psi | 67% | 2664 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 36,143 psi | 57% | 2575 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 44,817 psi | 70% | 2717 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,101 psi | 60% | 2585 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,368 psi | 71% | 2740 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,872 psi | 64% | 2644 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 41,060 psi | 64% | 2667 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,318 psi | 58% | 2628 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,427 psi | 73% | 2753 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,643 psi | 70% | 2733 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,383 psi | 73% | 2664 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,638 psi | 61% | 2526 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,830 psi | 67% | 2641 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 52,344 psi | 82% | 2851 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,905 psi | 72% | 2661 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,325 psi | 73% | 2749 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 36,912 psi | 58% | 2582 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 26,760 psi | 42% | 2405 fps | 95.9% |
| Somchem S385 | <<locked>> | 98% | 45,687 psi | 72% | 2789 fps | 95.6% |
| Unknown powder | <<locked>> | 82% | 34,954 psi | 55% | 2579 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 51,285 psi | 80% | 2707 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,816 psi | 69% | 2608 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,482 psi | 67% | 2641 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,409 psi | 66% | 2644 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,531 psi | 49% | 2434 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 82% | 34,911 psi | 55% | 2552 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 50,749 psi | 80% | 2822 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,018 psi | 66% | 2661 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,433 psi | 56% | 2595 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 31,792 psi | 50% | 2559 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,140 psi | 49% | 2441 fps | 96.7% |
| Winchester 748 | <<locked>> | 80% | 52,214 psi | 82% | 2874 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,772 psi | 67% | 2762 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,559 psi | 46% | 2566 fps | 96.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 100 powders for .300 WSM loaded with the .308 | 165gr | Geco STAR. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,048 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 60, Alliant Reloder-17, ReloadSwiss RS 70 rank at the top here: for .300 WSM with the .308 | 165gr | Geco STAR they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.